The brain to keep them focused on what they are doing so they don't have to risk anything
The abdication of Tsar Nicholas II was because of the Revolution of the Bolsheviks. The revolution ended Imperial Russia and started Communist Russia.
Maya used place value and zero in mathematics.
The Maya civilization was a Mesoamerican civilization developed by the Maya peoples, and prominent for its logosyllabic script, the most sophisticated and highly developed writing system in pre-Columbian Americas, along with its art, architecture, mathematics, calendar, and astronomical system. The Maya civilization developed in an area that comprised southeastern Mexico, all of Guatemala and Belize, and the western portions of Honduras and El Salvador.
Answer: B.) A formal settlement ended United States involvement in the Vietnam War.
Explanation: